android 二维码制造，显示到UI，并保存SD卡，拿来就能用！

转载请注明出处：王亟亟的大牛之路

现在二维码已经渗透了我们的生活，各种扫码关注啊，扫码下载的，今天上一个根据输入内容生成二维码的功能。

包结构：

界面截图：

功能：输入网址–>生成图片–>显示到Imageview–>储存到本地SD卡中

MainActivity(重要的部分已详细标注，生成的图片也经过测试可用)

public class MainActivity extends Activity {    ImageView imageview;    EditText webInput;    Button MakeImage;    Bitmap qrImage;    private  ProgressDialog mLoadingDialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        webInput=(EditText)findViewById(R.id.webInput);        imageview=(ImageView)findViewById(R.id.imageview);        MakeImage=(Button)findViewById(R.id.MakeImage);        //业务逻辑        doBusiness();    }    public void doBusiness(){        MakeImage.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                //判断是否有输入内容                if(webInput.getText().toString().equals("")||webInput==null){                    Toast.makeText(MainActivity.this, "请输入网址", Toast.LENGTH_SHORT).show();                    return;                }else{                    showLoadingDialog("Loading...");                    //回收bitmap                        if(null != qrImage && !qrImage.isRecycled()){                            qrImage.recycle();                            qrImage = null;                        }                          try {                            qrImage = makeQRImage(webInput.getText().toString(), 600, 600);                        } catch (WriterException e) {                            // TODO Auto-generated catch block                            e.printStackTrace();                        }                          imageview.setImageBitmap(qrImage);                            //生成图片                            if(isMountedSDCard()){                                String filePath =Environment.getExternalStorageDirectory()+ "/MyLive/QRImage/"+"aa"+".jpg";                                try {                                    //保存图片                                    saveAsJPEG(qrImage, filePath);                                } catch (IOException e) {                                    // TODO Auto-generated catch block                                    e.printStackTrace();                                }                                dismissLoadingDialog();                                Toast.makeText(MainActivity.this, "保存成功", Toast.LENGTH_LONG).show();                            }else{                                Toast.makeText(MainActivity.this, "没有安装SD卡", Toast.LENGTH_LONG).show();                            }                }            }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }    /*显示对话框*/    public void showLoadingDialog(String msg) {        if (mLoadingDialog != null && mLoadingDialog.isShowing()) {            return;        }        mLoadingDialog = new ProgressDialog(this);        mLoadingDialog.setMessage(msg);        // mLoadingDialog.setOnKeyListener(mOnKeyListener);        // mLoadingDialog.setCancelable(false);        mLoadingDialog.show();    }    /**     * 取消加载对话框     */    public void dismissLoadingDialog() {        if (mLoadingDialog != null) {            mLoadingDialog.dismiss();        }    }    /**     * 根据指定内容生成自定义宽高的二维码图片      * @param content 需要生成二维码的内容     * @param width 二维码宽度     * @param height 二维码高度     * @throws WriterException 生成二维码异常     */    public static Bitmap makeQRImage(String content, int width, int height)            throws WriterException {        // 判断URL合法性        if (!isNoBlankAndNoNull(content))            return null;        Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");        // 图像数据转换，使用了矩阵转换        BitMatrix bitMatrix = new QRCodeWriter().encode(content,                BarcodeFormat.QR_CODE, width, height, hints);        int[] pixels = new int[width * height];        // 按照二维码的算法，逐个生成二维码的图片，两个for循环是图片横列扫描的结果        for (int y = 0; y < height; y++) {            for (int x = 0; x < width; x++) {                if (bitMatrix.get(x, y))                    pixels[y * width + x] = 0xff000000;                else                    pixels[y * width + x] = 0xffffffff;            }        }        // 生成二维码图片的格式，使用ARGB_8888        Bitmap bitmap = Bitmap.createBitmap(width, height,                Bitmap.Config.ARGB_8888);        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);        return bitmap;    }    /**     * 判断字符串是否非空非null     * @param strParm 需要判断的字符串     * @return 真假     */    public static boolean isNoBlankAndNoNull(String strParm)    {      return ! ( (strParm == null) || (strParm.equals("")));    }    /**     * 指定目录写入文件内容     * @param filePath 文件路径+文件名     * @param content 文件内容     * @throws IOException     */    public static void saveAsJPEG(Bitmap bitmap,String filePath)            throws IOException {        FileOutputStream fos = null;        try {            File file = new File(filePath);            if (!file.getParentFile().exists()) {                file.getParentFile().mkdirs();            }            fos = new FileOutputStream(file);            bitmap.compress(Bitmap.CompressFormat.JPEG, 100,fos);            fos.flush();        } finally {            if (fos != null) {                fos.close();            }        }    }    public static boolean isMountedSDCard() {        if (Environment.MEDIA_MOUNTED.equals(Environment                .getExternalStorageState())) {            return true;        } else {            return false;        }    }}

布局文件:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.qrcodedemo.MainActivity" >    <ScrollView        android:id="@+id/scrollView1"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_alignParentTop="true" >        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:orientation="vertical" >        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:orientation="horizontal" >                  <TextView                android:id="@+id/textView1"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_alignBottom="@+id/webInput"                android:layout_alignParentLeft="true"                android:layout_alignTop="@+id/webInput"                android:text="输入网址:"                 android:textSize="16sp"                android:gravity="bottom"/>               <EditText                   android:id="@+id/webInput"                   android:layout_width="wrap_content"                   android:layout_height="wrap_content"                   android:layout_alignParentTop="true"                   android:layout_toRightOf="@+id/textView1"                   android:ems="10" >                   <requestFocus />               </EditText>        </LinearLayout>            <Button            android:id="@+id/MakeImage"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="MakeImage" />            <ImageView            android:id="@+id/imageview"            android:layout_width="fill_parent"            android:layout_height="wrap_content"/>        </LinearLayout>    </ScrollView></RelativeLayout>

源码地址：http://yunpan.cn/cd8sknyybpZzE 访问密码 8f62
因为在代码中已经注明，所以下源码看了用即可，不做过多解释用到的JAR包也在源码内